动态海缆抗多次冲击复合防护层设计及力学性能研究

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中图分类号：O383；TB21 国标学科代码：13035 文献标志码：A

Abstract：Toaddress the fracture problemofdynamicsubmarinecablesand their protectivesheathscausedbyfrictionand colision with wind turbine platformsunder harsh seaconditions，a multi-impact resistantcomposite protective layer was designedusing ethylenevinylacetate （EVA）foamand rubber as the main materials， which possesshighelasticityand excellent cushioning properties.Mechanical property tests were conducted onEVA foam materials with various relative densities under diferent loadingconditions usinga universal testing machineanddrop hammer.Energyabsorption eficiency，densification strain，plateaustressandmaximumspecificenergyabsorptionwereintroducedtocharacterizethe mechanicalpropertiesof EVA foam. The efects of relative density，strain rate and repeated loading on the energy absorption characteristics ofEVA foam wererevealed.Based on the matching relationship betweentheenergy absorption perunit volume ofEVA foamand the kinetic energyofdynamic submarinecables tobeabsorbed，the optimal thicknessof the protective layer was determined，nd composite protective layer specimens were fabricated. Subsequently，drop hammer impact tsts were performed to compare the cushioningand eergyabsorption characteristics ofthecompositeprotective layer withother materials，preliminarilyverifying its highenergyabsorptioneficiency.Furtherdrophammerimpact testswereconductedtoinvestigatetheeffectsof impact energyandloadingcyclesonthecushioningand energy absorptioncharacteristicsofthecompositeprotectivelayer.The experimentalresults displayed that：（1）under single impact，thepeak forceand maximum displacementof thecomposite protectivelayershowedalinearpositivecorelationwiththedrophammermassand impactvelocity，withenergyabsorption efficiencyreaching 85% ；（2）under multiple impacts，the mechanical propertiesof the composite protective layer exhibited remarkable stability-the maximum displacementinthe fourth impact increased byonly 5.5% compared with the first impact， with fluctuations in energy absorption value and instantaneous rebound rate remaining below 5% .The composite protective layerdemonstrates uniquemechanical propertiesthat provideefective long-term protection for dynamic submarinecables under harsh marine conditions.

Keywords：EVAfoam;quasi-staticcompresion;dynamiccompression;energyabsorption;cable protection

海上浮式风机发出的电能需要通过动态海缆进行输送，如图1（a）所示。（剩余19579字）